I have just completed a 2030A kit from ebay. When I hooked it up to the power supply (2x9V) all I get is a hum. No music just a hum. I have tried connecting it in both series and parallel and to a different transformer with same result. I've looked carefully at the board but can't see any obvious problems.
Any advice would be greatly appreciated. I had planned on replacing all the caps systematically to do some listening tests as I go along. But now I'm not sure this thing is worth the cost of the new components.

That one was damaged when the package came from China. This kit was supposed to have Chemicon and Panasonic capacitors but all it had was cheep Chinese crap. I had planned on replacing the caps when I get it up and running.
I just tried running it with a 12v wall wart - no hum but no sound either. This evening I am going re re-wire the inputs with some proper wire.

The missing resistor is now supposed to be used in the OCL circuit. I was wondering about the pot. I didn't want to use the on board one so haven't wired up the one I will be using. I was hoping to get the problem of the hum resolved first.
Could the damaged cap cause the hum?

without the pot the input signal is left floating and unconnected which will cause it to hum ....... connect the pot and the hum should go away , if you don't want to use a pot short the second and third pins together on each row ......